29 lines
572 B
C
29 lines
572 B
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Part of fork context switch microbenchmark.
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*
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* Copyright 2018, Anton Blanchard, IBM Corp.
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*/
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#define _GNU_SOURCE
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#include <sys/syscall.h>
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void _start(void)
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{
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asm volatile (
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"li %%r0, %[sys_exit];"
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"li %%r3, 0;"
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"sc;"
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:
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: [sys_exit] "i" (SYS_exit)
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/*
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* "sc" will clobber r0, r3-r13, cr0, ctr, xer and memory.
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* Even though sys_exit never returns, handle clobber
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* registers.
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*/
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: "r0", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
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"r11", "r12", "r13", "cr0", "ctr", "xer", "memory"
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);
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}
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